JP2001128404A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use insulating sheet of high thermal conductivity between the coil and stator of a motor in place of a conventional insulating paper, which is a heat insulating material and obstruction against coil cooling in order to improve the heat-radiating properties of the motor. SOLUTION: A motor has a stator main part 3, comprising a plurality of electromagnetic steel plates which are layered. Insulating sheets of high thermal conductivity 5 are applied to the layering surfaces of the slots 4 of the stator main part 3 and coils 6 are wound in the slots 3 with the high thermal conductivity insulating sheets 5 therebetween. As the high thermal conductivity insulating sheets 5 exist between the stator main part 3 and the coils 6, the heat of the coils 6 can be transmitted easily to the stator main part 3, and the superior hear-radiating properties of the motor can obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an electric motor in which heat is generated from a coil portion.

[0002]

2. Description of the Related Art Conventionally, stators provided with field windings of a motor and a generator are roughly divided into distributed windings in which a plurality of phase windings are arranged in a plurality of slots formed between stator pole teeth. And a concentrated winding stator in which one phase winding is wound around one stator pole tooth. In particular, unlike induction motors, which have secondary copper loss in the rotor, synchronous motors efficiently dissipate the heat generated by the stator windings. Can be realized.

In view of the above, conventionally, the surface area of the outer peripheral frame of the stator is increased by radiating fins, forced air cooling by a fan or the like, or liquid cooling is performed by using a cooling liquid passage provided in the frame. General. There are also those that directly cool the core winding inside the motor with oil, and those that release the internal heat to the outside with a heat pipe.However, cooling directly the inside of the motor increases the number of parts, The structure becomes complicated, and new issues such as securing reliability arise.

In order to supply a current to a winding which is a heat source,
Electrically insulate the surface of the winding, and also place insulating paper between the winding and the core made of electromagnetic steel sheet, etc. The wires are not broken. As the insulating paper, aramid paper or the like having excellent heat resistance and insulation properties is used. The above is the configuration of the winding part of a general motor.

[0005]

However, such an insulating paper is an electrical insulator, but it also becomes an insulator against heat, so that it becomes an obstacle in transmitting heat. The thermal conductivity of the aramid paper is about 0.14 W / mK. An object of the present invention is to provide an electric motor that facilitates transmission of heat generated in a coil portion to a stator and has good heat dissipation.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an electric motor having a stator core in which a plurality of electromagnetic steel sheets are laminated. A high heat conductive insulating sheet is disposed on a laminated surface of a slot portion of the stator core. A coil portion formed by applying a coil to the slot portion through a conductive insulating sheet, wherein a coil having a high thermal conductivity is disposed between the stator core and the coil portion. The heat of the part is easily transmitted to the stator core, and the heat dissipation of the motor is excellent.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an electric motor having a stator core in which a plurality of electromagnetic steel sheets are laminated. A high heat conductive insulating sheet is arranged on a slot lamination surface of the stator core. An electric motor characterized by forming a coil portion by applying a winding to the slot portion through a sheet, and disposing a high heat conductive insulating sheet between the stator core and the coil portion to form a coil portion. Heat is easily transmitted to the stator core, and the motor has excellent heat dissipation.

Further, the electric motor of the present invention has at least one
The windings are arranged over one or more slots, and the windings are arranged in the slots by a so-called distributed winding method in which a part of the windings of different phases exists during one winding pitch. To form a coil portion. Further, a stator including a coil portion formed by so-called concentrated winding in which windings are concentrically wound between adjacent slots, that is, teeth portions may be provided. Further, the electric motor of the present invention has a core segment in which a plurality of electromagnetic steel sheets are laminated, and a high heat conductive insulating sheet covering a slot laminated surface of the core segment,
A stator may be provided in which a stator component member including a coil portion formed by applying a winding to the teeth portion of the core segment is annularly combined.

Further, by providing the outer peripheral frame outside the stator core via the heat conductive resin, the heat generated in the coil portion is easily transmitted to the outer peripheral frame and easily radiated to the outside of the electric motor.

[0010]

(Embodiment 1) A stator 1 shown in FIG. 1 is formed by laminating a plurality of electromagnetic steel sheets. The stator 1 includes a stator body 3 having a plurality of teeth 2 and a stator body. 3
And a coil portion 6 in which a plurality of windings are formed in the high heat conductive insulating sheet 5 by a distributed winding method.

FIG. 2 is a view showing the vicinity of the end face of the stator 1. FIG. The high thermal conductive insulating sheet 5 is interposed between the coil portion 6 and the teeth portion 2 and covers the coil portion 6 to a portion slightly protruding from the end face of the stator main body 3. With this configuration, even if the coil section 6 is bent at the end face of the stator main body 3, the coil section 6 is protected by the high heat conductive insulating sheet 5, and the coil section 6 is not damaged at the end face of the stator main body 3.

In such a stator 1, the stator main body 3 and the coil portion 6 are in close contact with each other with the high heat conductive insulating sheet 5 interposed therebetween. The current of the coil section 6 does not flow to the stator body 3. On the other hand, since the high thermal conductive insulating sheet 5 has high thermal conductivity, heat generated in the coil portion 6 is easily transmitted to the stator body 3. That is, the heat generated in the coil portion 6 is easily transmitted to the stator main body 3, so that the motor is excellent in heat dissipation.

In FIG. 2, the high thermal conductive insulating sheet 5 looks like an integral pipe, but the sheet may surround the coil portion 6, that is, may have an overlapping opening, and as shown in FIG. The coil part 6 is the stator slot part 4
May be supported by another insulating sheet so as not to come out on the inner diameter side.

The rotor that enters the stator 1 includes:
A rotor having a permanent magnet, a rotor for a reluctance motor that does not use a permanent magnet, or a cage rotor for an induction machine may be used.

(Embodiment 2) FIG. 4 is a sectional view of a stator according to Embodiment 2 of the present invention. The stator body 31 includes the stator component 3
After the two are combined in an annular shape, they are covered and reinforced by the motor frame 33 from the outside. At this time, a heat conductive resin 36 (preferably insulating, but may be electrically conductive) is interposed between the motor frame 33 and the stator component 32. The heat conductive resin 36 is a grease-like silicone rubber that cures at room temperature, and after connecting the stator component 32 in a ring shape, is applied to the outer peripheral side surface of the fixed component 32,
The motor frame 33 is fitted. As described above, by interposing the heat conductive resin 36 between the stator constituent member 32 and the motor frame 33, the adhesion between the stator constituent member 32 and the motor frame 33 is increased, and the interposed heat conductive resin is provided. By increasing the heat transfer by the resin, the heat of the stator constituent member 32 is easily transmitted to the motor frame 33,
Excellent heat dissipation of the stator. The motor frame 33 is provided with a circulation passage 35 through which a cooling liquid and a cooling gas flow. If the frame outside the motor is air-cooled or liquid-cooled without directly cooling the inside of the motor, the increase in weight hardly occurs. A concentrated winding stator that can efficiently radiate the heat generated by the motor with a simple structure, improve the rated output, and achieve a long-life, high-performance motor without a reduction in life due to heat generation. To provide.

Further, the stator constituent member 32 of the second embodiment
As shown in FIGS. 5 and 6, the slot portion laminated surface 42 of the core segment 41 is covered with a high heat conductive insulating sheet 43. The high heat conductive insulating sheet 43 is disposed on the slot portion laminated surface 42 of the core segment 41, and when the insulator portion 44 is put on the core segment 41, the high heat conductive insulating sheet 43 is provided between the core segment 41 and the guide portion 45 of the insulator portion 44. The conductive insulating sheet 43 is interposed. Then, a coil is wound from above the insulator 41 to form the coil 46. The coil part 46 is in contact with the core segment 41 via the high heat conductive insulating resin 47 and the high heat conductive insulating sheet 43, and the heat generated in the coil part 46 is easily transmitted to the core segment 41. Further, the heat of the core segment 41 is transmitted to the motor frame 33 and radiated.

If the high heat conductive insulating sheet 43 has elasticity, it can be easily adhered to the coil portion 46 and the core segment 41. Further, the high thermal conductive insulating sheet 43
Consists of a highly elastic rubber-like high heat conductive layer and a high strength support layer.If the rubbery high heat conductive layer is on the coil part side, it is easy to adhere to the coil part and has a certain strength. Therefore, assembly of the stator is easy.

[0018]

According to the present invention, it is possible to provide an electric motor in which heat generated in the coil portion is easily transmitted to the core segment by using the high heat conductive insulating sheet for the slot portion, and the heat radiation is excellent.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stator according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an end face of the stator.

FIG. 3 is an enlarged view of a main part of the stator.

FIG. 4 is a sectional view of a stator according to a second embodiment of the present invention.

FIG. 5 is a view of the stator component viewed from the teeth side.

FIG. 6 is a partial sectional view of the stator component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 3 Stator main body 4 Slot part 5 High thermal conductive insulating sheet 6 Coil part

Claims (6)

[Claims] 1. A motor having a stator core in which a plurality of electromagnetic steel sheets are stacked, wherein a high heat conductive insulating sheet is disposed on a slot laminating surface of the stator core, and the slot is inserted through the high heat conductive insulating sheet. An electric motor characterized in that a coil portion is formed by applying a winding to a portion. 2. A so-called distributed winding system in which windings are arranged so as to straddle at least one or more slot portions, wherein a part of windings of different phases exists between one winding pitch. 2. The electric motor according to claim 1, wherein a coil is formed by applying a winding to the slot. 3. A coil formed by applying a winding to a slot by a so-called concentrated winding method in which a high thermal conductive insulating sheet covering a laminated surface of the slot and a concentric winding between adjacent slots, that is, teeth are concentrically wound. The electric motor according to claim 1, wherein the motor is formed. 4. A core segment in which a plurality of electromagnetic steel sheets are laminated, a high thermal conductive insulating sheet covering a slot laminating surface of the core segment, and a coil portion formed by applying a winding to a tooth portion of the core segment. And a stator comprising annularly combining stator constituent members comprising:
An electric motor as described. 5. The electric motor according to claim 1, wherein an outer peripheral frame is provided outside the stator core via a heat conductive resin. 6. The high thermal conductive insulating sheet has a thermal conductivity of 1 W.
The electric motor according to claim 1, which is not less than / mK.